Abstract
We have investigated the influence of the heterovalent substitution of Ce 4+ for Gd 3+ on the properties of RuSr 2GdCu 2O 8. Single-phase samples of RuSr 2Gd 1− x Ce x Cu 2O 8 with x=0, 0.02, and 0.05 have been successfully synthesized in oxygen at 1065 ∘C. The Ce substitution (electron doping) lowers the superconducting (SC) critical temperature from T c on=46 K for x=0 to 36 K for x=0.02, and also suppresses the spontaneous magnetization in the ordered state. The x=0.05 material is non-SC. The temperature of magnetic ordering increases from 132 K for x=0 to 145 K for the x=0.05 compound. Magnetic properties can be understood in terms of canted, antiferromagnetically aligned sublattice of Ru moments. We also report the increase of T c on to 61 K for the material with nominal composition RuSr 2Gd 0.9Ca 0.1Cu 2O 8, in which the partial substitution of Ca 2+ for the Gd 3+ can result in the increase of effective hole doping of the CuO 2 planes.
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